/*
 * Copyright (c) 2007, 2015, Oracle and/or its affiliates. All rights reserved.
 * ORACLE PROPRIETARY/CONFIDENTIAL. Use is subject to license terms.
 */
/*
 * Copyright 2003,2004 The Apache Software Foundation.
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *      http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

package com.sun.org.apache.xerces.internal.impl.xs;

import com.sun.org.apache.xerces.internal.dom.CoreDOMImplementationImpl;
import com.sun.org.apache.xerces.internal.dom.DOMMessageFormatter;
import com.sun.org.apache.xerces.internal.impl.xs.util.StringListImpl;
import com.sun.org.apache.xerces.internal.xs.StringList;
import com.sun.org.apache.xerces.internal.xs.XSException;
import com.sun.org.apache.xerces.internal.xs.XSImplementation;
import com.sun.org.apache.xerces.internal.xs.XSLoader;
import org.w3c.dom.DOMImplementation;


/**
 * Implements XSImplementation interface that allows one to retrieve an instance of
 * <code>XSLoader</code>. This interface should be implemented on the same object that implements
 * DOMImplementation.
 *
 * @author Elena Litani, IBM
 * @xerces.internal
 */
public class XSImplementationImpl extends CoreDOMImplementationImpl
    implements XSImplementation {

  //
  // Data
  //

  // static

  /**
   * Dom implementation singleton.
   */
  static XSImplementationImpl singleton = new XSImplementationImpl();

  //
  // Public methods
  //

  /**
   * NON-DOM: Obtain and return the single shared object
   */
  public static DOMImplementation getDOMImplementation() {
    return singleton;
  }

  //
  // DOMImplementation methods
  //

  /**
   * Test if the DOM implementation supports a specific "feature" --
   * currently meaning language and level thereof.
   *
   * @param feature The package name of the feature to test. In Level 1, supported values are "HTML"
   * and "XML" (case-insensitive). At this writing, com.sun.org.apache.xerces.internal.dom supports
   * only XML.
   * @param version The version number of the feature being tested. This is interpreted as "Version
   * of the DOM API supported for the specified Feature", and in Level 1 should be "1.0"
   * @return true iff this implementation is compatable with the specified feature and version.
   */
  public boolean hasFeature(String feature, String version) {

    return (feature.equalsIgnoreCase("XS-Loader") && (version == null || version.equals("1.0")) ||
        super.hasFeature(feature, version));
  } // hasFeature(String,String):boolean


  /* (non-Javadoc)
   * @see com.sun.org.apache.xerces.internal.xs.XSImplementation#createXSLoader(com.sun.org.apache.xerces.internal.xs.StringList)
   */
  public XSLoader createXSLoader(StringList versions) throws XSException {
    XSLoader loader = new XSLoaderImpl();
    if (versions == null) {
      return loader;
    }
    for (int i = 0; i < versions.getLength(); i++) {
      if (!versions.item(i).equals("1.0")) {
        String msg =
            DOMMessageFormatter.formatMessage(
                DOMMessageFormatter.DOM_DOMAIN,
                "FEATURE_NOT_SUPPORTED",
                new Object[]{versions.item(i)});
        throw new XSException(XSException.NOT_SUPPORTED_ERR, msg);
      }
    }
    return loader;
  }

  /* (non-Javadoc)
   * @see com.sun.org.apache.xerces.internal.xs.XSImplementation#getRecognizedVersions()
   */
  public StringList getRecognizedVersions() {
    StringListImpl list = new StringListImpl(new String[]{"1.0"}, 1);
    return list;
  }

} // class XSImplementationImpl
